LoginButton.java错误-在安卓系统上使用facebook sdk时遇到问题

Question

我在使用facebook sdk时遇到了麻烦。我使用Intellij Idea，我设法将sdk添加到项目中，并至少对其进行了编译。

因此，我从一个只有一个activity的空白项目开始，并添加了一个LoginButton，使我的Layout.xml看起来像这样：

    <?xml version="1.0" encoding="utf-8"?>

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
                  android:orientation="vertical"
                  android:layout_width="fill_parent"
                  android:layout_height="fill_parent"
        >
    <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello World, MainActivity"
            />

    <com.facebook.widget.LoginButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
</LinearLayout>

第一个问题是，我在UI预览窗口中收到以下消息：

android.content.res.Resources$NotFoundException: Could not resolve resource value: 0x7F060006.
    at android.content.res.BridgeResources.throwException(BridgeResources.java:693)
    at android.content.res.BridgeResources.getColor(BridgeResources.java:185)
    at com.facebook.widget.LoginButton.<init>(LoginButton.java:237)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
    at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:375)
    at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:100)
    at com.android.tools.idea.rendering.ProjectCallback.loadView(ProjectCallback.java:169)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:135)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:755)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:64)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:727)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:373)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:399)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:336)
    at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:332)
    at com.android.tools.idea.rendering.RenderService$3.compute(RenderService.java:564)
    at com.android.tools.idea.rendering.RenderService$3.compute(RenderService.java:553)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:932)
    at com.android.tools.idea.rendering.RenderService.createRenderSession(RenderService.java:553)
    at com.android.tools.idea.rendering.RenderService.render(RenderService.java:626)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:575)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1700(AndroidLayoutPreviewToolWindowManager.java:81)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$6$1.run(AndroidLayoutPreviewToolWindowManager.java:521)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178)
    at com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212)
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171)
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$6.run(AndroidLayoutPreviewToolWindowManager.java:516)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
    at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
    at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
    at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
    at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
    at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
    at com.intellij.util.Alarm$Request$1.run(Alarm.java:327)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:724)

所以看起来R文件有问题，但不管怎样，它仍然可以编译。

一旦应用程序在模拟器上运行，它就会崩溃，堆栈如下：

05-02 19:15:35.073    2023-2023/com.Jam D/dalvikvm﹕ Not late-enabling CheckJNI (already on)
05-02 19:15:35.453    2023-2029/com.Jam D/dalvikvm﹕ Debugger has detached; object registry had 1 entries
05-02 19:15:36.014    2023-2023/com.Jam D/﹕ HostConnection::get() New Host Connection established 0xb91d7290, tid 2023
05-02 19:15:36.514    2023-2023/com.Jam W/EGL_emulation﹕ eglSurfaceAttrib not implemented
05-02 19:15:36.564    2023-2023/com.Jam D/OpenGLRenderer﹕ Enabling debug mode 0
05-02 19:15:36.644    2023-2036/com.Jam W/dalvikvm﹕ threadid=11: thread exiting with uncaught exception (group=0xb1d8cb20)
05-02 19:15:36.644    2023-2036/com.Jam E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
    Process: com.Jam, PID: 2023
    java.lang.RuntimeException: An error occured while executing doInBackground()
            at android.os.AsyncTask$3.done(AsyncTask.java:300)
            at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
            at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
            at java.util.concurrent.FutureTask.run(FutureTask.java:242)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
     Caused by: java.lang.NullPointerException
            at java.util.concurrent.ConcurrentHashMap.containsKey(ConcurrentHashMap.java:911)
            at com.facebook.internal.Utility.queryAppSettings(Utility.java:372)
            at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:667)
            at com.facebook.widget.LoginButton$1.doInBackground(LoginButton.java:664)
            at android.os.AsyncTask$2.call(AsyncTask.java:288)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)

我是Android的新手，所以我不知道该怎么做。我的意思是，我的代码会抛出各种各样的异常:p，但我不知道为什么facebook SDK代码会抛出null异常。

Answer 1

我也面临着同样的问题：

我把我的app id写成这样：

<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="MY_APP_ID"/>

但它应该是：

<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>

我从来没有想过这会造成这样的错误。我想他们应该把这个作为警告放在他们的教程中！

试试看。如果这不是解决方案，那么它应该与app ID相关。您可能没有将keyhash添加到应用程序中。按照this教程中的每一步操作，不要跳过任何一步。

如果它仍然不能解决问题，请比较与facebook相关的SDK打包的facebook示例。

祝好运!

Answer 2

我曾经遇到过同样的问题，对我来说，这个问题与错误的元数据名称有关。确保你做对了。

<meta-data android:name="com.facebook.sdk.ApplicationId"   android:value="@string/facebook_app_id"/>

而不是

<meta-data android:name="com.facebook.sdk.Application"   android:value="@string/facebook_app_id"/>